I acquired a Leeds and Northrup 4776 four decade resistance box. This is compact instrument measures 150mm x 150mm x 85mm high.
Total resistance span is from 0.1ohm to 1111ohms.
Inside I found some very robust twenty-position switches. The switches allow the full decade to be selected twice for a full rotation, presumably to reduce wear and tear.
As you can see from the photos, the contacts are very robust but also need to be as the lowest range is in 0.1ohm steps.
I did a rough check and found it to be accurate. How accurate will have to wait until I install proper low-loss banana jacks.
As received, the box came with four multi-pin sockets including a centre-tapped 35.8ohm resistor. I would be happy to know the original purpose of those sockets and resistor.
For my use I am going to remove the 4 sockets and replace them with two quality banana jacks or posts.
Would be happy to know the resistance specs for this decade box, including tempco, if available.
enut11